DTT (Staging > Test) [robo-dtt] - #48041

Quoting from the documentation ([docs.rubocop.org](https://docs.rubocop.org/rubocop-rails/cops_rails.html#railsblank), [rubydoc.info](https://www.rubydoc.info/gems/rubocop-rails/RuboCop/Cop/Rails/Blank)):

> Checks for code that can be written with simpler conditionals using `Object#blank?` defined by Active Support.

There is certainly an argument to be made that there are situations in which `!foo.present?` and `something unless foo.present?` can be more readable than `foo.blank?` and `something if foo.blank?`, depending on the specific variable names involved, but I think they're rare enough that the consistency we gain by enabling this rule is worth it.